CVE-2026-45851None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: efi: Fix reservation of unaccepted memory table The reserve_unaccepted() function incorrectly calculates the size of the memblock reservation for the unaccepted memory…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
efi: Fix reservation of unaccepted memory table
The reserve_unaccepted() function incorrectly calculates the size of the memblock reservation for the unaccepted memory table. It aligns the size of the table, but fails to account for cases where the table's starting physical address (efi.unaccepted) is not page-aligned.
If the table starts at an offset within a page and its end crosses into a subsequent page that the aligned size does not cover, the end of the table will not be reserved. This can lead to the table being overwritten or inaccessible, causing a kernel panic in accept_memory().
This issue was observed when starting Intel TDX VMs with specific memory sizes (e.g., > 64GB).
Fix this by calculating the end address first (including the unaligned start) and then aligning it up, ensuring the entire range is covered by the reservation.
Linux >= 8dbe33956d96c9d066ef15ca933ede30748198b2 < b7bc182ec1846be437351e44164089d988f9d0ddLinux >= 8dbe33956d96c9d066ef15ca933ede30748198b2 < ba6b6f1502fa55621d1db23f253d54322bdbe4e0Linux >= 8dbe33956d96c9d066ef15ca933ede30748198b2 < 9b18bf59977f5c5bc3b11b210520f62500a7adf3Linux >= 8dbe33956d96c9d066ef15ca933ede30748198b2 < e649b5916725c68f44ebf45fb396df563c5dbaf2Linux >= 8dbe33956d96c9d066ef15ca933ede30748198b2 < 0862438c90487e79822d5647f854977d50381505Linux 6.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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